Flashburn is the recommend utility for the DSK. I am not aware of another good alternate. CCS has some flashing utlities but it is not supported on C6000. It is best to try to work your issues with SDS.
The hex utility is in the compiler folder. For C6000 in CCSv5.5, it would be in:
<INSTALL DIR>\ccsv5\tools\compiler\c6000_7.4.4\bin\hex6x.exe
For more information on this and related utilities, see the C6000 Assembly Language Tools User's Guide:
http://www.ti.com/lit/ug/spru186w/spru186w.pdf
Thanks
ki